linux-kernel - Re: [PATCH v7 16/22] sched: Defer wakeup in ttwu() for unschedulable frozen tasks

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Message-ID: <YK+x0tA/Xlm+N/vw@hirez.programming.kicks-ass.net>
Date:   Thu, 27 May 2021 16:50:58 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Will Deacon <will@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <maz@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Qais Yousef <qais.yousef@....com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Quentin Perret <qperret@...gle.com>, Tejun Heo <tj@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        kernel-team@...roid.com
Subject: Re: [PATCH v7 16/22] sched: Defer wakeup in ttwu() for unschedulable
 frozen tasks

On Thu, May 27, 2021 at 04:31:51PM +0200, Peter Zijlstra wrote:
> @@ -149,7 +144,7 @@ void __thaw_task(struct task_struct *p)
>  
>  	spin_lock_irqsave(&freezer_lock, flags);
>  	if (frozen(p))
> -		wake_up_process(p);
> +		wake_up_state(p, TASK_FROZEN);

Possibly, that wants | TASK_NORMAL added.

>  	spin_unlock_irqrestore(&freezer_lock, flags);
>  }